#include<iostream> 
using namespace std;
int solve(int a, int b)
{
	return (a + b - 1) / b;
}
int main()
{
	int a, b, n;
	while(cin >> a >> b >> n)
	{
		int t = solve(n - b, b - a) + solve(n - a, b - a);
		cout << t << endl;
	}
	return 0;
}
